package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.Collections;
import java.util.List;

/**
 * @Author: zhaoxinlei
 * @Date: 2025/3/30 21:11
 */
@Slf4j
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShopping(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入购物车的商品是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //若存在,数量加一即可
        if (list!=null&&list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }else{
            //若不存在,需要插入一条购物车数据
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId!=null){
                //本次添加到的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                //本次添加到的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }


    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        log.info("查看购物车");
        //获取当前用户id
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart =  ShoppingCart.builder()
                        .userId(userId)
                        .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    /**
     * 删除购物车
     *
     * @param shoppingCartDTO
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        log.info("删除购物车：{}", shoppingCartDTO);
        ShoppingCart shoppingCart = new ShoppingCart();
        //设置查询条件
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //设置当前用户id
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //查询当前菜品或套餐是否在购物车中
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //判断当前购物车中菜品数量是否为1
        if (list != null && list.size() > 0) {
            //如果为1，则直接删除
            ShoppingCart cart = list.get(0);
            if (cart.getNumber() == 1) {
                shoppingCartMapper.deleteById(cart.getId());
            } else {
                //如果不为1，则数量减一
                cart.setNumber(cart.getNumber() - 1);
                //更新数据库
                shoppingCartMapper.updateNumberById(cart);
            }
        }
    }
}
